(57) Liquid crystal modulation elements 925R, 925G and 925B are arranged so that light
outgoing surfaces 9252R, 9252G 5 and 9252B thereof face light incident surfaces 911R,
911G and 911b of a color synthesizing prism 910. Transparent plates 970R, 970G and
970B are bonded to the light outgoing surfaces 9252R, 9252G and 9252B of the liquid
crystal modulation elements 925R, 925G, and 925B. For this reason, 10 adhesion of
dust to the light outgoing surfaces 9252R, 9252G and 9252B of the liquid crystal modulation
elements 925R, 925G and 925B can be prevented. Further, it is possible to prevent
light reflection at the interface surface between the light outgoing surfaces 9252R,
9252G and 9252B and air 15 due to the difference in refractive index therebetween.
This allows a high-quality image to be projected without deteriorating the switching
characteristic of the liquid crystal modulation elements 925R, 925G and 925B while
preventing dirt from adhering to the light outgoing surfaces 9252R, 9252G and 9252B
of the liquid crystal modulation elements 925R, 925G and 925B.
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